opa: opa-istio sidecar keeps shutting down without any errors or warnings

Expected Behavior

opa-istio sidecar should come online fine.

Actual Behavior

opa-istio sidecar keeps shutting down without any errors or warnings.

Logs from the sidecar container:

{"addrs":["localhost:8181"],"diagnostic-addrs":["0.0.0.0:8282"],"level":"info","msg":"Initializing server.","time":"2021-02-16T09:00:07Z"}
{"level":"info","msg":"Starting decision logger.","plugin":"decision_logs","time":"2021-02-16T09:00:07Z"}
{"addr":":9191","dry-run":false,"enable-reflection":false,"level":"info","msg":"Starting gRPC server.","path":"myapp/authz/allow","query":"","time":"2021-02-16T09:00:07Z"}
{"level":"info","msg":"Shutting down...","time":"2021-02-16T09:00:36Z"}
{"level":"info","msg":"Server shutdown.","time":"2021-02-16T09:00:36Z"}
{"level":"info","msg":"Stopping decision logger.","plugin":"decision_logs","time":"2021-02-16T09:00:36Z"}

Steps to Reproduce the Problem

Follow the steps described here: https://github.com/open-policy-agent/opa-envoy-plugin/tree/master/examples/istio

policy.rego

package myapp.authz

default allow = true

opa-istio-config.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: opa-istio-config
  namespace: my-namespace
data:
  config.yaml: |
    plugins:
      envoy_ext_authz_grpc:
        addr: :9191
        path: myapp/authz/allow
    decision_logs:
      console: true

opa-istio.yaml

############################################################
# Envoy External Authorization filter that will query OPA.
############################################################
apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
metadata:
  name: ext-authz
  namespace: istio-system
spec:
  configPatches:
    - applyTo: HTTP_FILTER
      match:
        context: SIDECAR_INBOUND
        listener:
          filterChain:
            filter:
              name: "envoy.http_connection_manager"
              subFilter:
                name: "envoy.router"
      patch:
        operation: INSERT_BEFORE
        value:
          name: envoy.ext_authz
          typed_config:
            '@type': type.googleapis.com/envoy.extensions.filters.http.ext_authz.v3.ExtAuthz
            transport_api_version: V3
            status_on_error:
              code: ServiceUnavailable
            with_request_body:
              max_request_bytes: 8192
              allow_partial_message: true
            grpc_service:
              # NOTE(tsandall): when this was tested with the envoy_grpc client the gRPC
              # server was receiving check requests over HTTP 1.1. The gRPC server in
              # OPA-Istio would immediately close the connection and log that a bogus
              # preamble was sent by the client (it expected HTTP 2). Switching to the
              # google_grpc client resolved this issue.
              google_grpc:
                target_uri: 127.0.0.1:9191
                stat_prefix: "ext_authz"
---
############################################################
# Namespace for cluster-wide OPA-Istio components.
############################################################
apiVersion: v1
kind: Namespace
metadata:
  name: opa-istio
---
############################################################
# TLS certificate for OPA admission controller.
############################################################
apiVersion: v1
kind: Secret
metadata:
  name: server-cert
  namespace: opa-istio
data:
  tls.crt: |-
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  tls.key: |-
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---
############################################################
# OPA admission control policy for injecting OPA-Istio.
############################################################
apiVersion: v1
kind: ConfigMap
metadata:
  namespace: opa-istio
  name: inject-policy
data:
  inject.rego: |
    package istio

    inject = {
      "apiVersion": "admission.k8s.io/v1beta1",
      "kind": "AdmissionReview",
      "response": {
        "allowed": true,
        "patchType": "JSONPatch",
        "patch": base64.encode(json.marshal(patch)),
      },
    }

    patch = [{
      "op": "add",
      "path": "/spec/containers/-",
      "value": opa_container,
    }, {
      "op": "add",
      "path": "/spec/volumes/-",
      "value": opa_config_volume,
    }, {
      "op": "add",
      "path": "/spec/volumes/-",
      "value": opa_policy_volume,
    }]

    opa_container = {
      "image": "openpolicyagent/opa:0.26.0-istio",
      "name": "opa-istio",
      "args": [
        "run",
        "--server",
        "--config-file=/config/config.yaml",
        "--addr=localhost:8181",
        "--diagnostic-addr=0.0.0.0:8282",
        "/policy/policy.rego",
      ],
      "volumeMounts": [{
        "mountPath": "/config",
        "name": "opa-istio-config",
      }, {
        "mountPath": "/policy",
        "name": "opa-policy",
      }],
      "readinessProbe": {
        "httpGet": {
          "path": "/health?plugins",
          "port": 8282,
        },
      },
      "livenessProbe": {
        "httpGet": {
          "path": "/health?plugins",
          "port": 8282,
        },
      }
    }

    opa_config_volume = {
      "name": "opa-istio-config",
      "configMap": {"name": "opa-istio-config"},
    }

    opa_policy_volume = {
      "name": "opa-policy",
      "configMap": {"name": "opa-policy"},
    }
---
############################################################
# Service to expose OPA admission controller (required by Kubernetes.)
############################################################
apiVersion: v1
kind: Service
metadata:
  name: admission-controller
  namespace: opa-istio
  labels:
    app: admission-controller
spec:
  ports:
    - port: 443
      name: https
  selector:
    app: admission-controller
---
############################################################
# OPA admission controller deployment for injecting OPA-Istio.
############################################################
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: admission-controller
  namespace: opa-istio
  name: admission-controller
spec:
  replicas: 1
  selector:
    matchLabels:
      app: admission-controller
  template:
    metadata:
      labels:
        app: admission-controller
      name: admission-controller
    spec:
      tolerations:
        - effect: NoSchedule
          key: kubernetes.azure.com/scalesetpriority
          operator: Equal
          value: spot
      containers:
        - image: openpolicyagent/opa:0.26.0
          name: opa
          ports:
          - containerPort: 443
          args:
          - "run"
          - "--server"
          - "--tls-cert-file=/certs/tls.crt"
          - "--tls-private-key-file=/certs/tls.key"
          - "--addr=0.0.0.0:443"
          - "/policies/inject.rego"
          livenessProbe:
            httpGet:
              path: /health?plugins
              scheme: HTTPS
              port: 443
            initialDelaySeconds: 5
            periodSeconds: 5
          readinessProbe:
            httpGet:
              path: /health?plugins
              scheme: HTTPS
              port: 443
            initialDelaySeconds: 5
            periodSeconds: 5
          volumeMounts:
            - readOnly: true
              mountPath: /certs
              name: server-cert
            - readOnly: true
              mountPath: /policies
              name: inject-policy
      volumes:
        - name: inject-policy
          configMap:
            name: inject-policy
        - name: server-cert
          secret:
            secretName: server-cert
---
############################################################
# OPA admission controller configuration.
############################################################
apiVersion: admissionregistration.k8s.io/v1beta1
kind: MutatingWebhookConfiguration
metadata:
  name: opa-istio-admission-controller
webhooks:
  - name: istio.openpolicyagent.org
    clientConfig:
      service:
        name: admission-controller
        namespace: opa-istio
        path: "/v0/data/istio/inject"
      caBundle: |-
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    rules:
      - operations: ["CREATE"]
        apiGroups: [""]
        apiVersions: ["v1"]
        resources: ["pods"]
    namespaceSelector:
      matchLabels:
        opa-istio-injection: enabled
    failurePolicy: Fail

• opa-istio image: openpolicyagent/opa:0.26.0-istio
• istio-proxy image: rancher/istio-proxyv2:1.7.3

cc: @ashutosh-narkar